article · The European Physical Journal C
This research presents new generalised wormhole solutions developed within metric f(R) gravity theories using a specific power-law formulation that reduces to standard Einstein gravity under certain parameters. Setting the field equations within a time-independent Morris-Thorne spacetime, the investigation models anisotropic matter sources alongside energy densities linked to solitonic quantum wave and cold dark matter halos. Two distinct wormhole solutions are calculated, with shape functions that satisfy the geometric requirements in both cases. An analysis of energy conditions reveals that exotic matter violating both the null and weak energy conditions is present near the wormhole throats. Additionally, the study identifies a repulsive gravity effect characterised by negative light deflection angles across all tested throat radii. These results allow for a comparison of wormhole configurations across both matter distributions and the power-law gravity model.
Understanding alternative theories of gravity helps physicists explore cosmic phenomena that standard general relativity cannot fully explain. By modelling hypothetical structures such as wormholes within dark matter environments, this work deepens theoretical insight into how modified gravity and cosmic matter configurations might influence light deflection and the behaviour of space.
The abstract does not indicate an application pathway, as this is purely theoretical research in cosmological and gravitational physics.
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Abstract In this paper, we present new generalized wormhole (WH) solutions within the context of f ( R ) gravity. Specifically, we focus on f ( R ) gravitational theories formulated in the metric formalism, with our investigation centered on a power-law form represented by $$f(R) = \epsilon R^{\chi }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>f</mml:mi> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>R</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>=</mml:mo> <mml:mi>ϵ</mml:mi> <mml:msup> <mml:mi>R</mml:mi> <mml:mi>χ</mml:mi> </mml:msup> </mml:mrow> </mml:math> . Here, $$\epsilon $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>ϵ</mml:mi> </mml:math> is an arbitrary constant, and $$\chi $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>χ</mml:mi> </mml:math> is a real number. Notably, this form possesses the advantageous property of reducing to Einstein gravity when $$\epsilon =1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>ϵ</mml:mi> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> and $$\chi =1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>χ</mml:mi> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> . To obtain these novel WH solutions, we establish the general field equations for any f ( R ) theory within the framework of Morris–Thorne spacetime, assuming metric coefficients that are independent of time. By utilizing an anisotropic matter source and a specific type of energy density associated with solitonic quantum wave (SQW) and cold dark matter (CDM) halos, we calculate two distinct WH solutions. We thoroughly investigate the properties of the exotic matter (ExoM) residing within the WH geometry and analyze the matter contents through energy conditions (ECs). Both analytical and graphical methods are employed in this analysis to examine the validity of different regions. Notably, the calculated shape functions for the WH geometry satisfy the necessary conditions in both scenarios, emphasizing their reliability. Our investigations into specific parameter ranges in both scenarios revealed the presence of ExoM. This ExoM is characterized by an energy–momentum tensor that violates the null energy condition (NEC) and, consequently, the weak energy condition as well, in the vicinity of the WH throats. Furthermore, we investigated the repulsive effect of gravity and discovered that its presence results in a negative deflection angle for photons following null geodesics. Importantly, we observed that the deflection angle consistently exhibits negative values across all $$r_0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>r</mml:mi> <mml:mn>0</mml:mn> </mml:msub> </mml:math> values in both scenarios, indicating the manifestation of the repulsive gravity effect. Finally, we compare the obtained WH solutions utilizing both distributions, as well as the f ( R ) power-law-like models, in order to assess the feasibility of energetic configurations for WHs within SQW and CDM systems.
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DOI: 10.1140/epjc/s10052-024-13224-4
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